Overlapping Sidelink Channel Power Control for Uplink Interference
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Solution Overview
Problem
In LTE-V2X and NR-V2X systems, sidelink transmission can cause interference with uplink transmission, and existing power control schemes do not adequately address the higher reliability and latency requirements for autonomous driving scenarios.
Innovation Solution
A method and apparatus for determining transmission powers of physical sidelink channels based on specific criteria, including path loss and attributes of the data to be transmitted, to minimize interference and ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If open-loop power control scheme is introduced to avoid interference on uplink transmission, then interference on uplink transmission is reduced, but transmission reliability for autonomous driving scenarios is not adequately ensured
Solution Approach 1:
The patent applies dynamics by transitioning from a static open-loop power control scheme to a dynamic closed-loop power control mechanism. The terminal adjusts transmission power based on real-time feedback information including path loss, channel occupancy ratio, and transmission success rate, enabling adaptive power adjustment that responds to changing communication conditions to ensure reliable transmission while controlling interference.
Solution Approach 2:
The patent implements feedback by establishing a closed-loop power control system where the terminal receives feedback information from the network device about transmission quality and channel conditions. This feedback includes path loss values, channel occupancy ratios, and transmission success rates, which are used to dynamically adjust transmission power to balance interference control and transmission reliability.
2Reliability
If transmission power is increased to ensure high reliability for autonomous driving, then transmission reliability is improved, but interference with uplink transmission increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power based on multiple parameters including path loss, channel occupancy ratio, and transmission success rate. The terminal modifies power levels adaptively rather than using fixed high power, achieving reliable transmission when needed while minimizing interference during normal conditions through continuous parameter-based optimization.
3Object-affected harmful factors
If transmission power is decreased to reduce interference with uplink transmission, then interference on uplink transmission is reduced, but transmission latency increases
Solution Approach 1:
The patent applies dynamics by implementing adaptive power adjustment that responds to real-time channel conditions. When channel quality is poor or interference is detected, the system dynamically increases power to reduce latency and ensure timely transmission. When channel conditions are good, power is reduced to minimize interference, creating a dynamic balance between latency and interference control.
Data Source
AI summary
A wireless communication method and device, and a first terminal are provided. A wireless communication method, including: determining, by a first terminal, a transmission power for a first physical sidelink channel according to a first criterion, wherein the first criterion is used for indicating to the first terminal to determine the transmission power for the first physical sidelink channel; determining, by the first terminal, a transmission power for a second physical sidelink channel according to a second criterion, wherein transmission time of the first physical sidelink channel overlaps transmission time of the second physical sidelink channel partly; transmitting, by the first terminal, the first physical sidelink channel to a second terminal with the transmission power for the first physical sidelink channel; and transmitting, by the first terminal, the second physical sidelink channel to the second terminal with the transmission power for the second physical sidelink channel.